[SOLVED][L4T - opencv4tegra] cmake: error OpenCV librares set to NOTFOUND

Robotics & Edge Computing Jetson & Embedded Systems Jetson TK1
1

Hi,

I am currently writing a small program for on the Jetson TK1 board, to display some images.
Therefore I have to use OpenCV. The good thing is that the Jetpack R21.2 comes with an OpenCV library for Tegar, which is in ~/OpenCVTegra. In this folder is the libopencv4tegra-repo_l4t-r21_2.4.10.1_armhf.deb and a script to install it.

So far, so good.

Then I wrote the CMakeLists:

set(ProjectName "PfeDxReceiver")
project(${ProjectName})
cmake_minimum_required(VERSION 2.8.10)
...
...
#----------------------------------------------------------
# OpenCV
if(WITH_DispImg)
	find_package(OpenCV 2.4.10 REQUIRED)
	include_directories(${OpenCV_INCLUDE_DIR})
	link_directories(${OpenCV_LINK_DIRECTORIES})
	
	# Definition for the program
	add_definitions(-D_USE_OPENCV)
	message("opencv: inc:${OpenCV_INCLUDE_DIR}, 
			 link:${OpenCV_LINK_DIRECTORIES}, 
			 lib:${OpenCV_LIBRARIES}") 
	
endif()

...
...

When I ran the cmake-gui and press configure I get the following error:

CMake Error: The following variables are used in this project, but they are set to NOTFOUND.
Please set them or make sure they are set and tested correctly in the CMake files:
OpenCV_CONTRIB_LIBRARY (ADVANCED)
linked by target “PfeDxReceiver_bin” in directory /media/ubuntu/9C33-6BBD/Develop/PfeDxReceiver
OpenCV_CORE_LIBRARY (ADVANCED)

… strange…

So I did some research:
Usually the libs are under: /usr/lib/
but there aren’t any opencv libraries…

with

pkg-config --libs opencv

I get the following result:

/usr/lib/libopencv_calib3d.so /usr/lib/libopencv_contrib.so /usr/lib/libopencv_core.so /usr/lib
/libopencv_features2d.so /usr/lib/libopencv_flann.so /usr/lib/libopencv_gpu.so /usr/lib
/libopencv_highgui.so /usr/lib/libopencv_imgproc.so /usr/lib/libopencv_legacy.so /usr/lib
/libopencv_ml.so /usr/lib/libopencv_objdetect.so /usr/lib/libopencv_photo.so /usr/lib
/libopencv_stitching.so /usr/lib/libopencv_superres.so /usr/lib/libopencv_ts.a /usr/lib
/libopencv_video.so /usr/lib/libopencv_videostab.so /usr/lib/libopencv_esm_panorama.so /usr/lib
/libopencv_facedetect.so /usr/lib/libopencv_imuvstab.so /usr/lib/libopencv_tegra.so /usr/lib
/libopencv_vstab.so -lcufft -lnpps -lnppi -lnppc -lcudart -lrt -lpthread -lm -ldl

looks good to me.

find_package(opencv …) finds the following dirs:
inc:/usr/include/opencv
link:
lib:OpenCV_CONTRIB_LIBRARY-NOTFOUND;OpenCV_CORE_LIBRARY-NOTFOUND;OpenCV_FEATURES_LIBRARY-NOTFOUND;OpenCV_FLANN_LIBRARY-NOTFOUND;OpenCV_GPU_LIBRARY-NOTFOUND;OpenCV_HAARTRAINING_LIBRARY-NOTFOUND;OpenCV_HIGHGUI_LIBRARY-NOTFOUND;OpenCV_IMGPROC_LIBRARY-NOTFOUND;OpenCV_LEGACY_LIBRARY-NOTFOUND;OpenCV_ML_LIBRARY-NOTFOUND;OpenCV_NONFREE_LIBRARY-NOTFOUND;OpenCV_OBJDETECT_LIBRARY-NOTFOUND;OpenCV_PHOTO_LIBRARY-NOTFOUND;OpenCV_STITCHING_LIBRARY-NOTFOUND;OpenCV_TS_LIBRARY-NOTFOUND;OpenCV_VIDEO_LIBRARY-NOTFOUND;OpenCV_VIDEOSTAB_LIBRARY-NOTFOUND

When I ran a search for e.g. libopencv_highgui.so, it is located in /usr/lib.
Can it be that the Tegra specific version of OpenCV is not correctly supported with Cmake?

Custom-native compilation is not an option, described here:
http://elinux.org/Jetson/Installing_OpenCV#Getting_to_know_OpenCV
Cause:
“Note: Compiling OpenCV from source will not give you NVIDIA’s CPU optimizations that are only available in the closed-source prebuilt OpenCV4Tegra packages.”

Q1: What is wrong here?
Q2: Should I create the path variables for OpenCV stuff manually, in case I am building the project on the Tegra (It must support multiple platforms)? What would you recommend me?

Thank you in advance,
KR,
Roland

2

I’m not sure that the version of OpenCV installed by opencv4tegra is the 2.4.10.

Have you tried using simply

find_package( OpenCV REQUIRED )

without the release version?

3

Hi Myzhar,

Yes, I did and I didn’t change a thing. BUT I checked the FindOpenCV.cmake file which was quite deprecated. Now I use this one:
https://github.com/strasdat/VisionTools/blob/master/CMakeModules/FindOpenCV.cmake

set (OpenCV_DIR $ENV{OpenCV_DIR})
find_package(OpenCV2 REQUIRED)
if(NOT OpenCV_FOUND)
	message("OpenCV could not be found. Make sure that the ENV var OpenCV_DIR is set!")
else()
	message("opencv: inc:${OpenCV_INCLUDE_DIR}, 
			libs:${OpenCV_LIBS}, 
			version:${OpenCV_VERSION}")
	# Definition for the program
  	add_definitions(-D_USE_OPENCV)
endif()

(I named the file FindOpenCV2.cmake to maintain backward compatibility for the other projects)

Now cmake & make are running as desired :)
THX a lot!

KR, Roland

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